ΔE 18.7, loose: different enough that you should pick on purpose. Black Rose Immortal is a little darker, much more muted, warmer than Ruddy Terra.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 19). Black Rose Immortal is a little darker, much more muted, warmer than Ruddy Terra.
The same difference applies the other way round: Ruddy Terra is a little lighter, much more saturated, cooler.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Ruddy Terra on the colour wheel See Black Rose Immortal on the colour wheel
All matches: Ruddy Terra equivalents · Black Rose Immortal equivalents